/*
* Empire - A multi-player, client/server Internet based war game.
- * Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
+ * Copyright (C) 1986-2008, Dave Pare, Jeff Bailey, Thomas Ruschak,
* Ken Stevens, Steve McClure
*
* This program is free software; you can redistribute it and/or modify
*
* ---
*
- * See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
- * related information and legal notices. It is expected that any future
- * projects/authors will amend these files as needed.
+ * See files README, COPYING and CREDITS in the root of the source
+ * tree for related information and legal notices. It is expected
+ * that future projects/authors will amend these files as needed.
*
* ---
*
* Known contributors to this file:
* Dave Pare, 1989
* Steve McClure, 1997
- * Markus Armbruster, 2004
+ * Markus Armbruster, 2004-2006
*/
-#include "misc.h"
+#include <config.h>
+
+#include <ctype.h>
+#include <limits.h>
#include "file.h"
#include "match.h"
-#include "nsc.h"
+#include "player.h"
+#include "prototypes.h"
-static int nstr_promote(int valtype);
+static char *nstr_parse_val(char *, struct valstr *);
+static int nstr_match_ca(struct valstr *, struct castr *);
+static int nstr_match_val(struct valstr *, struct castr *, int);
+static int nstr_string_ok(struct castr *ca, int idx);
+static struct valstr *nstr_resolve_sel(struct valstr *, struct castr *);
+static struct valstr *nstr_mkselval(struct valstr *, int, struct castr *);
+static struct valstr *nstr_resolve_id(struct valstr *, struct castr *, int, int);
/*
* Compile conditions into array NP[LEN].
int
nstr_comp(struct nscstr *np, int len, int type, char *str)
{
+ struct castr *ca = ef_cadef(type);
char *cond;
char *tail;
int i;
struct nscstr dummy;
+ int lft_caidx, rgt_caidx;
+ int lft_val, rgt_val;
int lft_type, rgt_type;
cond = str;
np = &dummy;
/* left operand */
- tail = nstr_comp_val(cond, &np->lft, type);
- if (!tail)
- return -1;
+ tail = nstr_parse_val(cond, &np->lft);
+ lft_caidx = nstr_match_ca(&np->lft, ca);
/* operator */
if (*tail != '<' && *tail != '=' && *tail != '>' && *tail != '#') {
++tail;
/* right operand */
- tail = nstr_comp_val(tail, &np->rgt, type);
- if (!tail)
+ tail = nstr_parse_val(tail, &np->rgt);
+ rgt_caidx = nstr_match_ca(&np->rgt, ca);
+
+ /*
+ * Resolve identifiers
+ *
+ * An identifier can name a selector or, if the other operand
+ * is a selector, a value for that. The condition is
+ * ambiguous if both selector x value and value x selector are
+ * possible. Example: n<n for sectors could mean newdes<n or
+ * n<newdes.
+ */
+ lft_val = nstr_match_val(&np->lft, ca, rgt_caidx);
+ rgt_val = nstr_match_val(&np->rgt, ca, lft_caidx);
+ /*
+ * if lft_val >= 0, then rhs names a selector and lhs names
+ * one of its values. Likewise for rgt_val.
+ */
+ if (lft_val >= 0 && rgt_val >= 0) {
+ pr("%.*s -- condition ambiguous\n", (int)(tail-cond), cond);
return -1;
+ } else if (rgt_val >= 0) {
+ /* selector x value */
+ if (!nstr_resolve_sel(&np->lft, &ca[lft_caidx]))
+ return -1;
+ nstr_mkselval(&np->rgt, rgt_val, &ca[lft_caidx]);
+ } else if (lft_val >= 0) {
+ /* value x selector */
+ nstr_mkselval(&np->lft, lft_val, &ca[rgt_caidx]);
+ if (!nstr_resolve_sel(&np->rgt, &ca[rgt_caidx]))
+ return -1;
+ } else {
+ /*
+ * Neither side works as selector value; any identifiers
+ * must name selectors.
+ */
+ if (!nstr_resolve_id(&np->lft, ca, lft_caidx,
+ nstr_string_ok(ca, rgt_caidx)))
+ return -1;
+ if (!nstr_resolve_id(&np->rgt, ca, rgt_caidx,
+ nstr_string_ok(ca, lft_caidx)))
+ return -1;
+ }
/* find operator type, coerce operands */
lft_type = nstr_promote(np->lft.val_type);
rgt_type = nstr_promote(np->rgt.val_type);
np->optype = NSC_NOTYPE;
- if (lft_type == NSC_TYPEID) {
- if (!nstr_coerce_val(&np->rgt, NSC_TYPEID, str))
- np->optype = NSC_TYPEID;
- } else if (rgt_type == NSC_TYPEID) {
- if (!nstr_coerce_val(&np->lft, NSC_TYPEID, str))
- np->optype = NSC_TYPEID;
- } else if (lft_type == NSC_STRING) {
+ if (lft_type == NSC_STRING) {
if (!nstr_coerce_val(&np->rgt, NSC_STRING, str))
np->optype = NSC_STRING;
} else if (rgt_type == NSC_STRING) {
return i + 1;
}
+/* Like strcmp(S1, S2), but limit length of S1 to SZ1 and of S2 to SZ2. */
+static int
+strnncmp(char *s1, size_t sz1, char *s2, size_t sz2)
+{
+ int res;
+ if (sz1 == sz2) return strncmp(s1, s2, sz2);
+ if (sz1 < sz2) return -strnncmp(s2, sz2, s1, sz1);
+ res = strncmp(s1, s2, sz2);
+ return res ? res : s1[sz2];
+}
+
#define EVAL(op, lft, rgt) \
((op) == '<' ? (lft) < (rgt) \
: (op) == '=' ? (lft) == (rgt) \
: (op) == '>' ? (lft) > (rgt) \
: (op) == '#' ? (lft) != (rgt) \
- : 0)
+ : (CANT_REACH(), 0))
/*
* Evaluate compiled conditions in array NP[NCOND].
rgt = np[i].rgt;
nstr_exec_val(&rgt, player->cnum, ptr, optype);
switch (optype) {
- case NSC_TYPEID:
case NSC_LONG:
if (!EVAL(op, lft.val_as.lng, rgt.val_as.lng))
return 0;
return 0;
break;
case NSC_STRING:
- cmp = strcmp(lft.val_as.str, rgt.val_as.str);
+ cmp = strnncmp(lft.val_as.str.base, lft.val_as.str.maxsz,
+ rgt.val_as.str.base, rgt.val_as.str.maxsz);
if (!EVAL(op, cmp, 0))
return 0;
break;
default:
- CANT_HAPPEN("bad OPTYPE");
+ CANT_REACH();
return 0;
}
}
}
/*
- * Compile a value in STR into VAL.
- * Return a pointer to the first character after the value on success,
- * NULL on error.
- * TYPE is the context type, a file type.
- * If STR names an array, VAL simply refers to the element with index
- * zero.
+ * Parse a value in STR into VAL.
+ * Return a pointer to the first character after the value.
+ * Value is either evaluated into NSC_STRING, NSC_DOUBLE or NSC_LONG,
+ * or an identifier.
*/
-char *
-nstr_comp_val(char *str, struct valstr*val, int type)
+static char *
+nstr_parse_val(char *str, struct valstr *val)
{
- char id[32];
long l;
double d;
char *tail, *tail2;
- struct castr *cap;
- unsigned i;
- int j;
- val->val_type = NSC_NOTYPE;
- val->val_cat = NSC_NOCAT;
- val->val_as_type = -1;
+ /* string */
+ if (str[0] == '\'') {
+ for (tail = str + 1; *tail && *tail != '\''; ++tail) ;
+ /* FIXME implement \ quoting */
+ val->val_type = NSC_STRING;
+ val->val_cat = NSC_VAL;
+ val->val_as.str.base = str + 1;
+ val->val_as.str.maxsz = tail - (str + 1);
+ if (*tail) ++tail;
+ /* FIXME else unclosed string */
+ return tail;
+ }
+ /* identifier */
if (isalpha(str[0])) {
- /* identifier */
- for (i = 0; isalnum(str[i]) || str[i] == '_'; ++i) {
- if (i < sizeof(id) - 1)
- id[i] = str[i];
- }
- tail = str + i;
- if (i < sizeof(id)) {
- id[i] = 0;
-
- val->val_as_type = typematch(id, type);
-
- cap = ef_cadef(type);
- if (cap) {
- j = stmtch(id, cap, offsetof(struct castr, ca_name),
- sizeof(struct castr));
- if (j >= 0
- && (!(cap[j].ca_flags & NSC_DEITY) || player->god)) {
- if (cap[j].ca_type == NSC_TYPEID && val->val_as_type >= 0)
- /*
- * Got two matches of type NSC_TYPEID, need to
- * choose. Prefer typematch(), because ?des=n
- * would be interpreted as ?des=newdes
- * otherwise
- */
- ;
- else {
- val->val_type = cap[j].ca_type;
- val->val_cat = NSC_OFF;
- val->val_as.sym.off = cap[j].ca_off;
- val->val_as.sym.idx = 0;
- }
- }
- } else
- j = M_NOTFOUND;
- } else
- j = M_NOTFOUND;
-
- if (val->val_type == NSC_NOTYPE) {
- if (val->val_as_type >= 0) {
- val->val_type = NSC_TYPEID;
- val->val_cat = NSC_VAL;
- val->val_as.lng = val->val_as_type;
- } else if (j >= 0)
- pr("%s -- selector access denied\n", id);
- else if (j == M_NOTUNIQUE)
- pr("%s -- ambiguous selector name\n", id);
- else
- pr("%s -- unknown selector name\n", id);
- }
-
- return val->val_type == NSC_NOTYPE ? NULL : tail;
+ for (tail = str+1; isalnum(*tail) || *tail == '_'; ++tail) ;
+ val->val_type = NSC_NOTYPE;
+ val->val_cat = NSC_ID;
+ val->val_as.str.base = str;
+ val->val_as.str.maxsz = tail - str;
+ return tail;
}
- /* single character type */
- id[0] = str[0];
- id[1] = 0;
- val->val_as_type = typematch(id, type);
-
- /* literals */
+ /* number */
l = strtol(str, &tail, 0);
d = strtod(str, &tail2);
if (tail2 > tail) {
val->val_as.lng = l;
return tail;
}
- /* FIXME implement NSC_STRING literals */
- CANT_HAPPEN(val->val_type != NSC_NOTYPE);
- if (val->val_as_type >= 0) {
- val->val_type = NSC_TYPEID;
+ /* funny character, interpret as identifier */
+ tail = str+1;
+ val->val_type = NSC_NOTYPE;
+ val->val_cat = NSC_ID;
+ val->val_as.str.base = str;
+ val->val_as.str.maxsz = tail - str;
+ return tail;
+}
+
+/*
+ * Match VAL in table of selector descriptors CA, return index.
+ * Return M_NOTFOUND if there are no matches, M_NOTUNIQUE if there are
+ * several.
+ * A VAL that is not an identifier doesn't match anything. A null CA
+ * is considered empty.
+ */
+static int
+nstr_match_ca(struct valstr *val, struct castr *ca)
+{
+ char id[32];
+
+ if (val->val_cat != NSC_ID || val->val_as.str.maxsz >= sizeof(id))
+ return M_NOTFOUND;
+
+ if (!ca)
+ return M_NOTFOUND;
+
+ memcpy(id, val->val_as.str.base, val->val_as.str.maxsz);
+ id[val->val_as.str.maxsz] = 0;
+
+ return stmtch(id, ca, offsetof(struct castr, ca_name),
+ sizeof(struct castr));
+}
+
+/*
+ * Match VAL in a selector's values, return its (non-negative) value.
+ * Match values of selector descriptor CA[IDX], provided IDX is not
+ * negative. CA may be null when IDX is negative.
+ * Return M_NOTFOUND if there are no matches, M_NOTUNIQUE if there are
+ * several.
+ */
+static int
+nstr_match_val(struct valstr *val, struct castr *ca, int idx)
+{
+ char id[32];
+
+ if (val->val_cat != NSC_ID || val->val_as.str.maxsz >= sizeof(id))
+ return M_NOTFOUND;
+
+ if (idx < 0 || ca[idx].ca_table == EF_BAD)
+ return M_NOTFOUND;
+ if (CANT_HAPPEN(nstr_promote(ca[idx].ca_type) != NSC_LONG))
+ return M_NOTFOUND;
+
+ memcpy(id, val->val_as.str.base, val->val_as.str.maxsz);
+ id[val->val_as.str.maxsz] = 0;
+
+ return ef_elt_byname(ca[idx].ca_table, id);
+}
+
+/*
+ * Can CA[IDX] be compared to a string?
+ * Return 0 for negative IDX.
+ */
+static int
+nstr_string_ok(struct castr *ca, int idx)
+{
+ return idx >= 0 && nstr_promote(ca[idx].ca_type) == NSC_STRING;
+}
+
+/*
+ * Change VAL to resolve identifier to selector or string.
+ * Return VAL on success, NULL on error.
+ * No change if VAL is not an identifier. Otherwise, change it as
+ * follows.
+ * Error if IDX == M_NOTUNIQUE or IDX == M_NOTFOUND and !STRING_OK.
+ * Change into string if IDX == M_NOTFOUND and STRING_OK.
+ * Change into selector CA[IDX] if IDX >= 0.
+ */
+static struct valstr *
+nstr_resolve_id(struct valstr *val, struct castr *ca, int idx, int string_ok)
+{
+ if (val->val_cat != NSC_ID)
+ return val;
+
+ if (idx == M_NOTUNIQUE && !string_ok) {
+ pr("%.*s -- ambiguous name\n",
+ (int)val->val_as.str.maxsz, val->val_as.str.base);
+ val->val_cat = NSC_NOCAT;
+ return NULL;
+ }
+
+ if (idx == M_NOTFOUND && !string_ok) {
+ pr("%.*s -- unknown name\n",
+ (int)val->val_as.str.maxsz, val->val_as.str.base);
+ val->val_cat = NSC_NOCAT;
+ return NULL;
+ }
+
+ if (idx < 0) {
+ CANT_HAPPEN(!string_ok);
+ /* interpret unresolvable identifier as string */
+ val->val_type = NSC_STRING;
val->val_cat = NSC_VAL;
- val->val_as.lng = val->val_as_type;
- return str + 1;
+ /* map identifier ~ to empty string, like some commands do */
+ if (val->val_as.str.maxsz == 1 && val->val_as.str.base[0] == '~')
+ val->val_as.str.maxsz = 0;
+ return val;
}
- pr("%s -- invalid value for condition\n", str);
- return NULL;
+ return nstr_resolve_sel(val, &ca[idx]);
}
/*
- * Promote VALTYPE.
- * If VALTYPE is an integer type, return NSC_LONG.
- * If VALTYPE is a floating-point type, return NSC_DOUBLE.
- * If VALTYPE is NSC_STRINGY, return NSC_STRING.
- * If VALTYPE is NSC_NOTYPE, NSC_STRING or NSC_TYPEID, return VALTYPE.
+ * Change VAL to resolve identifier to selector CA.
+ * Return VAL on success, NULL if the player is denied access to the
+ * selector.
+ * VAL must be an identifier.
*/
-static int
-nstr_promote(int valtype)
+static struct valstr *
+nstr_resolve_sel(struct valstr *val, struct castr *ca)
+{
+ if (CANT_HAPPEN(val->val_cat != NSC_ID)) {
+ val->val_cat = NSC_NOCAT;
+ return val;
+ }
+
+ if ((ca->ca_flags & NSC_DEITY) && !player->god) {
+ pr("%.*s -- not accessible to mortals\n",
+ (int)val->val_as.str.maxsz, val->val_as.str.base);
+ val->val_cat = NSC_NOCAT;
+ return NULL;
+ }
+
+ val->val_type = ca->ca_type;
+ val->val_cat = NSC_OFF;
+ val->val_as.sym.off = ca->ca_off;
+ val->val_as.sym.len = ca->ca_len;
+ val->val_as.sym.idx = 0;
+ val->val_as.sym.get = ca->ca_get;
+ return val;
+}
+
+/*
+ * Initialize VAL to value SELVAL for selector CA, return VAL.
+ */
+static struct valstr *
+nstr_mkselval(struct valstr *val, int selval, struct castr *ca)
{
- switch (valtype) {
- case NSC_NOTYPE:
- case NSC_LONG:
- case NSC_DOUBLE:
- case NSC_STRING:
- case NSC_TYPEID:
- break;
- case NSC_CHAR:
- case NSC_UCHAR:
- case NSC_SHORT:
- case NSC_USHORT:
- case NSC_INT:
- case NSC_XCOORD:
- case NSC_YCOORD:
- case NSC_TIME:
- valtype = NSC_LONG;
- break;
- case NSC_FLOAT:
- valtype = NSC_DOUBLE;
- break;
- case NSC_STRINGY:
- valtype = NSC_STRING;
- break;
- default:
- CANT_HAPPEN("bad VALTYPE");
- valtype = NSC_NOTYPE;
+ if (CANT_HAPPEN(nstr_promote(ca->ca_type) != NSC_LONG
+ || ca->ca_table == EF_BAD)) {
+ val->val_type = NSC_NOTYPE;
+ val->val_cat = NSC_NOCAT;
+ return val;
}
- return valtype;
+
+ val->val_type = ca->ca_type;
+ val->val_cat = NSC_VAL;
+ val->val_as.lng = selval;
+ return val;
+}
+
+/*
+ * Compile a value in STR into VAL.
+ * Return a pointer to the first character after the value on success,
+ * NULL on error.
+ * TYPE is the context type, a file type.
+ * If STR names an array, VAL simply refers to the element with index
+ * zero.
+ */
+char *
+nstr_comp_val(char *str, struct valstr *val, int type)
+{
+ struct castr *ca = ef_cadef(type);
+ char *tail = nstr_parse_val(str, val);
+ if (!nstr_resolve_id(val, ca, nstr_match_ca(val, ca), 0))
+ return NULL;
+ return tail;
}
static int
if (from != to) {
switch (to) {
- case NSC_TYPEID:
- if (val->val_as_type >= 0) {
- val->val_cat = NSC_VAL;
- val->val_as.lng = val->val_as_type;
- } else
- return cond_type_mismatch(str);
- break;
case NSC_STRING:
return cond_type_mismatch(str); /* FIXME implement */
case NSC_DOUBLE:
case NSC_LONG:
return cond_type_mismatch(str);
default:
- CANT_HAPPEN("bad TO argument");
+ CANT_REACH();
to = from;
}
}
if (val->val_cat == NSC_VAL) {
- /* coord literals don't occur, conversion not implemented */
+ /* unimplemented conversions; don't currently occur here */
CANT_HAPPEN(val->val_type == NSC_XCOORD
- || val->val_type == NSC_YCOORD);
+ || val->val_type == NSC_YCOORD
+ || val->val_type == NSC_HIDDEN);
val->val_type = to;
}
return 0;
}
-
-/*
- * Evaluate VAL.
- * If VAL is symbolic, evaluate it into a promoted value type.
- * Use coordinate system of country CNUM.
- * PTR points to a context object of the type that was used to compile
- * the value.
- * Unless WANT is NSC_NOTYPE, coerce the value to promoted value type
- * WANT. VAL must be coercible. That's the case if a previous
- * nstr_coerce_val(VAL, WANT, STR) succeeded.
- */
-void
-nstr_exec_val(struct valstr *val, natid cnum, void *ptr, nsc_type want)
-{
- char *memb_ptr;
- nsc_type valtype = NSC_LONG;
- int idx;
-
- switch (val->val_cat) {
- default:
- CANT_HAPPEN("Bad VAL category");
- /* fall through */
- case NSC_VAL:
- valtype = val->val_type;
- break;
- case NSC_OFF:
- memb_ptr = ptr;
- memb_ptr += val->val_as.sym.off;
- idx = val->val_as.sym.idx;
- switch (val->val_type) {
- case NSC_CHAR:
- val->val_as.lng = ((signed char *)memb_ptr)[idx];
- break;
- case NSC_UCHAR:
- val->val_as.lng = ((unsigned char *)memb_ptr)[idx];
- break;
- case NSC_SHORT:
- val->val_as.lng = ((short *)memb_ptr)[idx];
- break;
- case NSC_USHORT:
- val->val_as.lng = ((unsigned short *)memb_ptr)[idx];
- break;
- case NSC_INT:
- val->val_as.lng = ((int *)memb_ptr)[idx];
- break;
- case NSC_LONG:
- val->val_as.lng = ((long *)memb_ptr)[idx];
- break;
- case NSC_XCOORD:
- val->val_as.lng = xrel(getnatp(cnum), ((short *)memb_ptr)[idx]);
- break;
- case NSC_YCOORD:
- val->val_as.lng = yrel(getnatp(cnum), ((short *)memb_ptr)[idx]);
- break;
- case NSC_FLOAT:
- val->val_as.dbl = ((float *)memb_ptr)[idx];
- valtype = NSC_DOUBLE;
- break;
- case NSC_DOUBLE:
- val->val_as.dbl = ((double *)memb_ptr)[idx];
- valtype = NSC_DOUBLE;
- break;
- case NSC_STRINGY:
- CANT_HAPPEN(idx);
- val->val_as.str = (char *)memb_ptr;
- valtype = NSC_STRING;
- break;
- case NSC_STRING:
- val->val_as.str = ((char **)memb_ptr)[idx];
- valtype = NSC_STRING;
- break;
- case NSC_TIME:
- val->val_as.lng = ((time_t *)memb_ptr)[idx];
- break;
- case NSC_TYPEID:
- val->val_as.lng = ((signed char *)memb_ptr)[idx];
- valtype = NSC_TYPEID;
- break;
- default:
- CANT_HAPPEN("Bad VAL type");
- val->val_as.lng = 0;
- }
- val->val_cat = NSC_VAL;
- }
-
- if (valtype == want)
- ;
- else if (want == NSC_DOUBLE) {
- if (valtype == NSC_LONG) {
- valtype = want;
- val->val_as.dbl = val->val_as.lng;
- }
- } else if (want == NSC_STRING)
- CANT_HAPPEN("unimplemented WANT"); /* FIXME */
- if (CANT_HAPPEN(valtype != want && want != NSC_NOTYPE)) {
- valtype = want;
- switch (want) {
- case NSC_TYPEID:
- case NSC_LONG: val->val_as.lng = 0; break;
- case NSC_DOUBLE: val->val_as.dbl = 0.0; break;
- case NSC_STRING: val->val_as.str = ""; break;
- default:
- CANT_HAPPEN("bad WANT argument");
- }
- }
-
- val->val_type = valtype;
-}
projects / empserver / blobdiff